Drive for vehicles



Feb. 8,1927. 1,616,617

C. FROESCH DRIVE FOR VEHICLES Filed July 1. 1926 2 Sheets-sheaf, 1

a l gnvemcoz I CHarles Froesch.

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c. FROESCH DRIVE FOR VEHICLES Filed July 1. 9 6 2 Sheets-Sheet 2 lufnl" nventoz Charls F Patented Feb. 8, 1927.

' I I t am PANY, OFNEWYOBK, N. 2;, A QQRPQRATION or DELAWARE;

q-nnrvn roe vnnrotns;

Applioationjfiled J 1,1 3 1,

This invention relates to what is known to ,ably'rear-wa-rdly of the engine andgenerator,

from transyersez-members I), b of the chassis f-rame ofwthe yehicle, the rear wheels being thetrade as [a gas electric drive particularly applicabletoheavy duty trucks and the like. To utilize a gas electric drive" in vehicles -.of this nature without sacrifice of the pulling ability afforded by the reqnisitetrans- .mission gear ratio and driving chain,it is "necessary to provide at least Ea-16 to '25-1.

1 gear ratio between the eleetriemotor and the rear wheels in order that a small motor may be used and the weight of'thestruCture kept down to a practical amount.

i .Qne difficultyinthe application ofa gas electric drive to heavy duty trucks is that shou-ldthe truck with such ahigh gear ratio coast down hills, forinstance, at every highspeed anergcessive electric motor speed will result. As the limiting 1 peripheral speed of amotor armature of the size necessary is limited to about 10,000 ft. per minute, it will be obvious thatqmeansmust be provided (if gas electric drives are to be applied to trucks of this character) which will prevent the limiting peripheral speed of the motor armature from being exceeded. This the present invention seeks'to accomplish by utilization of the centrifugal force of given weights to apply a mechanical brake to the motor shaft, the parts being so proportioned that this limiting speed may be held to any given rate.

The invention also resides in the structural features adapted to electric motors of standard design from the standpoint of practicability in manufacture and use.

Reference will now be had to the accompanying drawings illustrating a preferred embodiment thereof, in which:'

Figure 1 is a fragmentary view of the chassis, frame of a motor vehicle supporting an electric motor to which the automatic brake devices according to the present inventionihave been applied.

Figure 2 is a vertical longitudinal sectional view. taken in the plane indicated by the lines 2-2 of Figures 1 and 3' and looking in the direction of the arrows, and showing a fragmentary portion of the motor shaft and the automatic braking devices connected thereto. 4

Figure 3 is a transverse vertical sectional view taken in the plane indicated by the line 33 in Figure 2 and looking in the direction of the arrows and showing particularly the automatic braking mechanism according to the invention."

' it Will. be

1.926. aria 2.110.; 1119.872.

,The electric motor 1c is supported, prefer.-

fdriven from rearwardly extending pro.-

;; It ferries r wgrrric g, j

versal joint (Z, to the hub e 'SVllflCllilS keyed,

it a fifti th-sen Qft eaianat e s af a. of the electric motor. Should tjhe peripheral ture, say when the vehiclecoasts downa on the hub are ,caused tonove outwardly under the action of centrifugal for.ce aga nst the action-of limiting springs h, 7 and to brake drum i and tend,- by frictional en pe ciethe p op l er sha t ce se dith Y m e':perirh a spe d Of met ra m P hill at. very high speed, weigh-ts f, f-slidabile, r011 the garrns 'g- ,of aspider igfykeyediiw a-t g3,

gagement therewith, to carry the brake drum I about with the shaft a. The brake drum't' is formed with or has bolted thereto an arm '11 extendingupwardly through an elongated slot 9' formed in a cylindrical brake anchor member j carried on an inwardly directed disc 7' adapted to be bolted as by the bolts j to the end of thehousing a of themotor. As the arm ivmoves, say, in a counterclockwise direction in the slot j, through the instrumentalityv of: the frictional engagement of the brake shoes f, it bears against'the end of. an internal band'brake is. This brake band is anchored, as at to the brake anchor j and expands under the influence of the force applied against the action of the return spring Z and brakes the brake drum we carried on the end of the shaft 6;.

q The weights] and the spring h are-so proportioned' that the brake shoes are held out of engagement with the drum '11 at rest or low motor speeds.

centrifugal force. throws the weights outwardly to engage the brake drum. The greater centrifugal force exerted by the weights. the greater will be the resultant braking'effort. Thus the maximum speed of the truck and the electric motor-is governed underv all conditions. The internal hand brake is availed of to obtain aservo When the motor shaft exj .ceeds a givenspeed of say 4,000 B, P. M. the

action, thereby multiplying the braking 7 force. y

noted thatthe brakeanchor j prevent the rotation of the motor armature is so mounted upon the disc 7' as to enclose the elements of the brake mechanism between itself and the outer disc m of brake drum m.

- It will thus be seen that (myself-contained braking unit has been provided which acts in the nature of a governor to automatically atva speed greater than the permissive limiting peripheral speed of the motor armature.

Various modifications may be made in the disposition and configuration of the com ponent elements going to make up the invention as a whole and no limitation is in tended by the phraseology of the foregoing description except as indicated in the appended claims.

Vfhatis claimed is: V 1. In a device of the character described, in combination, an electric motor, a brake drumcarried with the motor shaft and freely rotatable with respect thereto, a spider having radial arms carried with the motor shaft, weights slidable on the arms,:springs of predetermined strength to retract the weights, brake shoes carried with the weights to engage the drum and means carried with said drum to expand another brake shoe into operative engagement with another brake drum carried fixedly with said shaft.

2. In a device of the character described, in combination, an electric motor, ,a brake drum concentric with'the shaft and freely rotatable with respect thereto, a spider carried with the shaft and having radial arms, weight-s slidable on the arms, springs to retract the weights, brake shoes carried with the weights to engage t-he freely rotatable drum, a brake drum carried by; the shaft, a

brake band, and means operable upon rotation of the first named brake drum to expand the brake bandagainst the second named brake drum.

' 3. In a device of the character described,

in combination, an electric motor, a spider having radial arms carried with the motor shaft, Weights reciprocal on the arms, springs to retract the weights, brake shoes carried its other end by the arm, and a brakedrum carried with the motor shaft and engageable by the brake band. v

This specification signed this 23rd day of June A. D. 1926. I

CHARLES FROESCH. 

